str1='hello'
str2='hello world'
str3='''hello'''
print(str1)
print(str2)
print(str3)
print('hel\'lo world')
print('123---{0}'.format(4))
str1='hello'
print(f'123---{str1}')

for i in range(0,101,2):
    print("==========开始下载==========")
    if i == 100:
        print("下载完成")
    else:
       #/print(f'{i}%','[',"*"*(i//2),"."*((100-i)//2),']')#/
        str4="*"*(i//2)+"."*((100-i)//2)
        print(f'{i}%{str4}')
